Valve-gear



3 Sheets-Sheet H. F. GASKILL.

(No Model.)

VALVE GEAR.

No. 374,298. Patented Dec. 6, 1887.

INVENTIJRI N. PETERS, Phuln-Ulhognphar, Wuhinglnn. D. c,

3 Sheets-Sheet 8.

(No Model.)

H. F. GASKILL.

VALYEYGEAR.

No. 374,298. Patented Dec. 6, 1887.

UNITED STATES PATENT OFFICE.

HARVEY F. GASKILL, OF LOGKPORT, NEW YORK.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 374:,298, dated December 6, 1887. Application filed June 1887. Serial No. 242,314. (No model.)

To all whom it may concern Be it known thatI, HARVEY F. GASKILL, of Loclrport, New York, have invented certain new anduseful Improvements in ValveGears, of which the following is a specification.

My invention relates more particularly to engines of the Corliss type with a single controlling-valve at each end of the cylinder, to act for both admission and exhaust; and it consists in certain mechanism for operating the valves, as is designated in the claims at the end hereof.

In the accompanying drawings I have represented so much of an engine containing my invention as is necessary to an understanding of the latter.

Figure l of the drawings is a side elevation of thesteam end of the engine, the cylinder being partly in section. Fig. 2 isatransverse section through the middle of the cylinder. Fig. 8 is a separate view in perspective of the valve levers or arms. Figs. 4., 5, 6, 7, 8, and 9 show the parts represented in Fig. 3 separated from each other, but maintaining their proper consecutive positions. Figs. 10 and 11 are sectional elevations to show the action of the valve levers or arms.

The principal parts of the mechanism represented in the drawings are as follows: a cylinder; a port at each end of said cylinder; admission and eXhauststeam passages approaching said port; a valve at each end of the cylinder adapted to throw said port into communication with either the admission or the exhaust-steam passage, as desired; a rocking or rotating stem by which the valve is moved; an eccentric or its equivalent; an arm connected to the eccentric-rod and capable of rocking independently ofthe valve-stem; a spring or its equivalent; an arm connected to the spring and capable of rocking independently of the valve-stem; suitable tongues or their equivalent on said arms, which at times engage other tongues on the valve-stem, thus causing the eccentric or the spring to act on the valve; a governor; an arm acted on by the governor and capable of rocking independently of the valve-stem; a pawl or dog or its equivalent connected to the arm, which is rocked by the eccentric and adapted to connect said arm with the valve-stem to open the valve. The dog is thrown out of engagement by the action of the governor and spring to close the valve.

In the drawings, A is the cylinder; at, the steam-pipe; b, a steam-belt connecting pipe a with steam-passage e.

G is a part of the engine-frame.

D is the valve; E E, the stems of the two valves.

fis the port of valve D g is the exhaust-passage.

R is a collar which is keyed to the valvestem. 1 and 7c are tongues on said collar.

G is an arm which fits loosely on said collar. his a tongue on said arm adapted to engage tongue i on collar It.

I is an air-spring connected with the end of arm G. I prefer an air-spring to any other form, because it may also act as a dash-pot to arrest the motion of arm G.

F is an arm provided with a hub, Z, which fits loosely on the valve-stem. The base of the arm incloses collar R and has a tongue, j, on its interior,whieh engages tongue k. The end of arm F is connected to the eccentricrod h, as shown in Fig. 1.

J is a pawl or dog which is connected to the base of arm F and is adapted to engage tongue 70.

n is an arm connected with pawl J. The end of arm it rests normally on hub Z, as is seen in Fig. 11.

H is an arm which fits-loosely on hub Z, so as to rock thereon. The hub of arm H is partly cut away to accommodate arm a. The ends of the out are sloped, as shown at m in Fig. 11, so that as arm H is rocked the end of arm a will ride up the slope and throw pawl J up out of engagement with k. The end of arm H is connected by a rod, 0, with a rock-arm, d, operated by the governor.

In operation the arm F is rocked to and fro by the eccentric. In its motion one way its tongue j engages tongue in and moves the valve, opening communication of g with fand permitting the cylinder to exhaust. As the arm moves in the reverse direction, the dog J engages tongue 76 and moves the valve so as to close the exhaust and open the admission-passage. This motion of the valve brings tongue 11 into engagement with tongue h, and thus acts 011 spring I, putting it under strain. When in the course of this movement the arm permits the ICC n reaches incline M, it rides up on the incline and raises dog J with it. This frees tongue 7:, and the spring I, acting through arm G and tongues h and i, closes the valve, thus cutting off the steam. The valve remains closed until tongue j again engages tongue 70. The point of out-off is determined by the position of incline m, and this is regulated by the governor acting through rod S, bent lever 0 (2, rod 0, and arm 11 Having thus described an embodiment of my invention in the form which I at present consider the best, I claim- 1.7, The combination, substantially as set 7 the engine, the tongue and the dog secured to i said arm, the spring, the arm connected to the spring, the tongue on said arm, and the arm. operated by the governor.

2. The combination, substantially as set forth, of the arm F, tongue 9', dog J, tongues 70 and 1', arm G, tongue h, arm H, trip m, and arm n.

HARVEY F. GASKILL.

Witnesses:

M. G. WILMARTH,

F. H. SEYMOUR. 

